The CAT is coming along. I'm having troubles making adapters for everything. For example, the belt runs for the Y-carriages are kind of awkward. I have a good idea on how to tackle them, just gotta CAD em out and figure out the details as we go.
I came back to the V-groove idea. I think it has potential. It would be really easy to make the x-carriage at that point. I already designed a standard one... but it would be easier to assemble if it was just a plate. hmmm.... I'll probably end up trying both out and see which I like more.